nodejs 按行读取 readline

 1 //普通读取方法

 2 // var data = fs.readFileSync(versionpath,'utf8');

 3     // var dataarr = data.split('\n');

 4     // dataarr.forEach(function(dataarr) {

 5     //     if( dataarr.indexOf('version') > -1) {

 6     //         version =  (dataarr.split(':')[1]).match(/\"(.*)\"/)[1];

 7     //         return;

 8     //     }

 9     // })

 //按行读取

      // 创建写入临时文件夹

     if(!fs.existsSync('./yotmp')){

         fs.mkdirSync('./yotmp');

     }

     // tmpPath = './yotmp/version.scss';

     // fs.writeFileSync(tmpPath, '');

     var file = fs.createReadStream(versionpath);

     var out = fs.createWriteStream('./yotmp/varialbes.scss');

     log(out);

     var rl = readline.createInterface({

         input: file,

         output: out

     });

     rl.on('line', function (line){

         log('line:' + line);

         if( line.indexOf('version') > -1) {

             version =  (line.split(':')[1]).match(/\"(.*)\"/)[1];

             fsUtil.rmDirSync('./yotmp');

             log("///////////////");

             rl.close();

             return;

         }

     });